Wood Pet Gate How Do I Mount To Metal Wall Studs?

How do I mount to metal wall studs? - wood pet gate

I'm trying to get this dog door in the wall:

http://www.retract-a-gate.com/retract-a- ...

Where I go, not of metal, not wood wall stud. Since asparagus is not wood, it can deepen the screws to mount the door. What is (the piece of drilling equipment, special screws, etc.) I buy and how do I get the tacos? Thank you!